Custom report: Share stats between tickers

Hi all,

I was wondering whether there is a way to share report performance stats between tickers?

Basically, I am running an individual backtest with a "Summary" type report and in the report list I am getting Net Profits for each ticker. Now I would like to add them up as a cumulative profit.
I could do that by writing and reading each net profit to a file but was wondering whether there is a better way to do that. (I am familiar with the custom user metrics)

BTW, is there a way to modify or create a html report other than just adding lines at the end?

Many thanks